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# If A is 3 × 4 mat

Order of A = 3 × 4

Order of A’ = 4 × 3

As ATB and BAT are both defined, so the number of columns in B should be equal to the number of rows in A’ for BA’ and also the number of columns in A’ should be equal to the number of rows in A’ for BA’.

So the order of matrix B = 3 × 4.

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